SN54HC640, SN74HC640
OCTAL BUS TRANSCEIVERS
WITH 3 STATE OUTPUTS
SCLS303D - JANUARY 1996 - REVISED AUGUST 2003
1
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
D
Wide Operating Voltage Range of 2 V to 6 V
D
High-Current 3-State Outputs Can Drive Up
To 15 LSTTL Loads
D
Low Power Consumption, 80-
A Max I
CC
D
Typical t
pd
= 8 ns
D
6-mA Output Drive at 5 V
D
Low Input Current of 1
A Max
D
Inverting Logic
SN54HC640 . . . J OR W PACKAGE
SN74HC640 . . . DW, N, NS, OR PW PACKAGE
(TOP VIEW)
SN54HC640 . . . FK PACKAGE
(TOP VIEW)
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
15
14
13
12
11
DIR
A1
A2
A3
A4
A5
A6
A7
A8
GND
V
CC
OE
B1
B2
B3
B4
B5
B6
B7
B8
3
2
1 20 19
9 10 11 12 13
4
5
6
7
8
18
17
16
15
14
B1
B2
B3
B4
B5
A3
A4
A5
A6
A7
A2
A1
DIR
B7
B6
OE
A8
GND
B8
V
CC
description/ordering information
These octal bus transceivers are designed for asynchronous two-way communication between data buses.
These devices transmit data from the A bus to the B bus or from the B bus to the A bus, depending upon the
level at the direction-control (DIR) input. The output-enable (OE) input can be used to disable the device so the
buses are effectively isolated.
ORDERING INFORMATION
TA
PACKAGE
ORDERABLE
PART NUMBER
TOP-SIDE
MARKING
PDIP - N
Tube of 20
SN74HC640N
SN74HC640N
SOIC - DW
Tube of 25
SN74HC640DW
HC640
SOIC - DW
Reel of 2000
SN74HC640DWR
HC640
-40
C to 85
C
SOP - NS
Reel of 2000
SN74HC640NSR
HC640
-40 C to 85 C
Tube of 70
SN74HC640PW
TSSOP - PW
Reel of 2000
SN74HC640PWR
HC640
TSSOP - PW
Reel of 250
SN74HC640PWT
HC640
CDIP - J
Tube of 20
SNJ54HC640J
SNJ54HC640J
-55
C to 125
C
CFP - W
Tube of 85
SNJ54HC640W
SNJ54HC640W
-55 C to 125 C
LCCC - FK
Tube of 55
SNJ54HC640FK
SNJ54HC640FK
Package drawings, standard packing quantities, thermal data, symbolization, and PCB design
guidelines are available at www.ti.com/sc/package.
Copyright
2003, Texas Instruments Incorporated
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of Texas Instruments
standard warranty. Production processing does not necessarily include
testing of all parameters.
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
On products compliant to MIL PRF 38535, all parameters are tested
unless otherwise noted. On all other products, production
processing does not necessarily include testing of all parameters.
SN54HC640, SN74HC640
OCTAL BUS TRANSCEIVERS
WITH 3 STATE OUTPUTS
SCLS303D - JANUARY 1996 - REVISED AUGUST 2003
2
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
FUNCTION TABLE
(each transceiver)
INPUTS
OPERATION
OE
DIR
OPERATION
L
L
B data to A bus
L
H
A data to B bus
H
X
Isolation
logic diagram (positive logic)
A1
B1
OE
DIR
To Seven Other Transceivers
19
1
2
18
absolute maximum ratings over operating free-air temperature range (unless otherwise noted)
Supply voltage range, V
CC
-0.5 V to 7 V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Input clamp current, I
IK
(V
I
< 0 or V
I
> V
CC
) (see Note 1)
20 mA
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Output clamp current, I
OK
(V
O
< 0 or V
O
> V
CC
) (see Note 1)
20 mA
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Continuous output current, I
O
(V
O
= 0 to V
CC
)
35 mA
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Continuous current through V
CC
or GND
70 mA
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Package thermal impedance,
JA
(see Note 2): DW package
58
C/W
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
N package
69
C/W
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
NS package
60
C/W
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
PW package
83
C/W
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Storage temperature range, T
stg
-65
C to 150
C
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Stresses beyond those listed under "absolute maximum ratings" may cause permanent damage to the device. These are stress ratings only, and
functional operation of the device at these or any other conditions beyond those indicated under "recommended operating conditions" is not
implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
NOTES:
1. The input and output voltage ratings may be exceeded if the input and output current ratings are observed.
2. The package thermal impedance is calculated in accordance with JESD 51-7.
SN54HC640, SN74HC640
OCTAL BUS TRANSCEIVERS
WITH 3 STATE OUTPUTS
SCLS303D - JANUARY 1996 - REVISED AUGUST 2003
3
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
recommended operating conditions (see Note 3)
SN54HC640
SN74HC640
UNIT
MIN
NOM
MAX
MIN
NOM
MAX
UNIT
VCC
Supply voltage
2
5
6
2
5
6
V
VCC = 2 V
1.5
1.5
VIH
High-level input voltage
VCC = 4.5 V
3.15
3.15
V
VIH
High-level input voltage
VCC = 6 V
4.2
4.2
V
VCC = 2 V
0.5
0.5
VIL
Low-level input voltage
VCC = 4.5 V
1.35
1.35
V
VIL
Low-level input voltage
VCC = 6 V
1.8
1.8
V
VI
Input voltage
0
VCC
0
VCC
V
VO
Output voltage
0
VCC
0
VCC
V
VCC = 2 V
1000
1000
t/
v
Input transition rise/fall time
VCC = 4.5 V
500
500
ns
t/
v
Input transition rise/fall time
VCC = 6 V
400
400
ns
TA
Operating free-air temperature
-55
125
-40
85
C
NOTE 3: All unused inputs of the device must be held at VCC or GND to ensure proper device operation. Refer to the TI application report,
Implications of Slow or Floating CMOS Inputs, literature number SCBA004.
electrical characteristics over recommended operating free-air temperature range (unless
otherwise noted)
PARAMETER
TEST CONDITIONS
VCC
TA = 25
C
SN54HC640
SN74HC640
UNIT
PARAMETER
TEST CONDITIONS
VCC
MIN
TYP
MAX
MIN
MAX
MIN
MAX
UNIT
2 V
1.9
1.998
1.9
1.9
IOH = -20
A
4.5 V
4.4
4.499
4.4
4.4
VOH
VI = VIH or VIL
IOH = -20
A
6 V
5.9
5.999
5.9
5.9
V
VOH
VI = VIH or VIL
IOH = -6 mA
4.5 V
3.98
4.3
3.7
3.84
V
IOH = -7.8 mA
6 V
5.48
5.8
5.2
5.34
2 V
0.002
0.1
0.1
0.1
IOL = 20
A
4.5 V
0.001
0.1
0.1
0.1
VOL
VI = VIH or VIL
IOL = 20
A
6 V
0.001
0.1
0.1
0.1
V
VOL
VI = VIH or VIL
IOL = 6 mA
4.5 V
0.17
0.26
0.4
0.33
V
IOL = 7.8 mA
6 V
0.15
0.26
0.4
0.33
II
DIR or OE
VI = VCC or 0
6 V
0.1
100
1000
1000
nA
IOZ
A or B
VO = VCC or 0
6 V
0.01
0.5
10
5
A
ICC
VI = VCC or 0,
IO = 0
6 V
8
160
80
A
Ci
DIR or OE
2 V to 6 V
3
10
10
10
pF
SN54HC640, SN74HC640
OCTAL BUS TRANSCEIVERS
WITH 3 STATE OUTPUTS
SCLS303D - JANUARY 1996 - REVISED AUGUST 2003
4
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
switching characteristics over recommended operating free-air temperature range, C
L
= 50 pF
(unless otherwise noted) (see Figure 1)
PARAMETER
FROM
TO
VCC
TA = 25
C
SN54HC640
SN74HC640
UNIT
PARAMETER
FROM
(INPUT)
TO
(OUTPUT)
VCC
MIN
TYP
MAX
MIN
MAX
MIN
MAX
UNIT
2 V
29
105
160
130
tpd
A or B
B or A
4.5 V
10
21
32
26
ns
tpd
A or B
B or A
6 V
8
18
27
22
ns
2 V
109
230
340
290
ten
OE
A or B
4.5 V
27
46
68
58
ns
ten
OE
A or B
6 V
20
39
58
49
ns
2 V
40
150
225
190
tdis
OE
A or B
4.5 V
18
30
45
38
ns
tdis
OE
A or B
6 V
16
26
38
32
ns
2 V
20
60
90
75
tt
A or B
4.5 V
8
12
18
15
ns
tt
A or B
6 V
6
10
15
13
ns
switching characteristics over recommended operating free-air temperature range, C
L
= 150 pF
(unless otherwise noted) (see Figure 1)
PARAMETER
FROM
TO
VCC
TA = 25
C
SN54HC640
SN74HC640
UNIT
PARAMETER
FROM
(INPUT)
TO
(OUTPUT)
VCC
MIN
TYP
MAX
MIN
MAX
MIN
MAX
UNIT
2 V
44
190
290
235
tpd
A or B
B or A
4.5 V
14
38
58
47
ns
tpd
A or B
B or A
6 V
11
33
49
41
ns
2 V
124
315
470
395
ten
OE
A or B
4.5 V
31
63
94
79
ns
ten
OE
A or B
6 V
23
54
80
68
ns
2 V
45
210
315
265
tt
A or B
4.5 V
17
42
63
53
ns
tt
A or B
6 V
13
36
53
45
ns
operating characteristics, T
A
= 25
C
PARAMETER
TEST CONDITIONS
TYP
UNIT
Cpd
Power dissipation capacitance
No load
40
pF
SN54HC640, SN74HC640
OCTAL BUS TRANSCEIVERS
WITH 3 STATE OUTPUTS
SCLS303D - JANUARY 1996 - REVISED AUGUST 2003
5
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
PARAMETER MEASUREMENT INFORMATION
VOLTAGE WAVEFORM
INPUT RISE AND FALL TIMES
50%
50%
10%
10%
90%
90%
VCC
0 V
tr
tf
Input
VOLTAGE WAVEFORMS
PROPAGATION DELAY AND OUTPUT TRANSITION TIMES
50%
50%
50%
10%
10%
90%
90%
VCC
VOH
VOL
0 V
tr
tf
Input
In-Phase
Output
50%
tPLH
tPHL
50%
50%
10%
10%
90%
90%
VOH
VOL
tr
tf
tPHL
tPLH
Out-of-Phase
Output
50%
10%
90%
VCC
VCC
VOL
0 V
Output
Control
(Low-Level
Enabling)
Output
Waveform 1
(See Note B)
50%
tPZL
tPLZ
VOLTAGE WAVEFORMS
ENABLE AND DISABLE TIMES FOR 3-STATE OUTPUTS
VOH
0 V
50%
50%
tPZH
tPHZ
Output
Waveform 2
(See Note B)
VCC
Test
Point
From Output
Under Test
CL
(see Note A)
RL
VCC
S1
S2
LOAD CIRCUIT
PARAMETER
CL
tPZH
tpd or tt
tdis
ten
tPZL
tPHZ
tPLZ
1 k
1 k
50 pF
or
150 pF
50 pF
Open
Closed
RL
S1
Closed
Open
S2
Open
Closed
Closed
Open
50 pF
or
150 pF
Open
Open
--
NOTES: A. CL includes probe and test-fixture capacitance.
B. Waveform 1 is for an output with internal conditions such that the output is low except when disabled by the output control.
Waveform 2 is for an output with internal conditions such that the output is high except when disabled by the output control.
C. Phase relationships between waveforms were chosen arbitrarily. All input pulses are supplied by generators having the following
characteristics: PRR
1 MHz, ZO = 50
, tr = 6 ns, tf = 6 ns.
D. The outputs are measured one at a time with one input transition per measurement.
E. tPLZ and tPHZ are the same as tdis.
F. tPZL and tPZH are the same as ten.
G. tPLH and tPHL are the same as tpd.
Figure 1. Load Circuit and Voltage Waveforms
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